Deep tissue massage involves applying firm pressure and slow strokes to reach deeper layers of muscle and fascia (the connective tissue surrounding muscles). There is usually a build-up of pressure during the first few stages of the massage, then the therapist will put more pressure on your body and muscles to get into the deep layers of muscles, when the superficial layers of muscles have relaxed. This will help your body pump blood through the muscles and ease tension. Deep tissue massage helps push out lactic acid from the deep muscle fibres in your body.